Disk or octagon shaped craft traveled over home

1st I noticed a strange sound. Almost light a hum that seemed to come from the ground. I live near an airstrip so I am familiar with plane and chopper sounds. This was neither. You can also tell when its coming from above. I did not see the craft until it was above me. It was just above the trees and it had 2 large white lights, somewhat close together on the underside. One blinking and 1 steady. They were the only ones. I tried to see the shape but even though it was a clear night, it was hard to tell. When the light blinked it looked fuzzy, like the reflection from a cloud. Kinda pearly color. From the flashing I would estimate 25-30 ft across but couldn't see the edges to be sure. The other thing that was so odd was that it was moving slow... too slow for a plane. My dog looked at it as well. I watched it as it kept moving towards the olympic mountains, trying to come up with a logical explanation . I was never afraid but can't sleep and get it out of my mind. My parents and I saw 3 ufos about 55 yrs ago as well. Investigator can contact me if they want but not necessary.